Pay in 4 interest-free payments of $8.22 Learn more
Ships within 48 hours · Estimated delivery Sep 13 - Sep 18
but the 421-557 is chassis-specific
The KT63ZZ098 is designed for standard duty applications (200 series)
If the resistance deviates significantly from the standard PTC resistance chart
OEM Compatibility: Precision-fit design ensures seamless integration with existing Fenwal ignition modules and flame sensors
When should I replace the electrode wire
Lochinvar & A.O. Smith 100208064 Filter Els PW 29614 but the 421-557 is chassis-specificEnsure peak combustion efficiency and protect internal components with the Lochinvar & A. O. Smith 100208064 Filter. This OEM replacement air filter is a critical maintenance item for high efficiency boiler systems, measuring exactly 16"x12"x1". Designed to meet the precise pressure drop requirements of Lochinvar Knight and A. O. Smith boiler models, it effectively captures airborne particulates before they reach the blower assembly or heat exchanger.